Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92e4b19acf56ef8000471776b029f17e6cfd508373ba8f523eb327f4ea56020' 
  AND token = 'YYlrfFYjj7LKyLZe9EBFeFwpNtDwGEtDqGYs0c+iUAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}